Brake-shoe control.



L. ZINK.

BRAKE SHOE CONTROL.

APPLICATION HLED DEO.29, 1911.

1,038,059, PatntedSept. 10,1912.

wizbnwoeo COLUMBIA PLANOGRAPH co.. WASHINGTON. n. c.

LUZIAN ZINK, OF DETROIT, MICHIGAN.

, BRAKE-SHOE CONTROL.

' Specification of Letters Patent.

Patented Sept. 16,1912.

Application filed December 29, 1911. Serial No. 668,403.

T all whom it may concern:

Be it known that I, LUZIAN ZINK, a citizen of the United States ofAmerica, residing at Detroit, in the county of Wayne and State ofMichigan, have invented certain .new and useful Improvements in Brake-Shoe Control, of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to a brake shoe control for railway cars and moreespecially to an arrangement thereof adapted for use on cars with swiveltrucks or bogies whereby the angular motion of the truck relative to thecar body does not effect the application of power to the brake shoes andWhere-.

by the power applying means is safe from accident 1n case of a partialbreak down or abnormal displacement of the truck dueto splitting aswitch or the like. i

. The invention consists in the matters hereinafter set forth and moreparticularly pointed out in the appended claims.

In the drawings, Figure 1 isa plan View,

line V- V of Fig. 3.

Referring to the drawings a pair of truck wheels 1 is equipped withbrake shoes 2 which may be forced against them through power appliedto'what is termed a circle bar 3 having a center of curvature coincidentwith that of the pivot pin 4 of the truck. The connections between thecircle bar 3 and the brake shoes 2 are of any preferred type and aremerely indicated herein as at 5.

A yoke preferably formed integrally of forged metal, cast steel or likesuitable matter consists of an upper roller plate 6 having pockets 7 inwhich friction rolls 8 are journaled to ride on the circle bar 3, and alower keeper plate 9 underlying the circle bar 3. In preferred form theupper bearing plate 7 which is suitably ribbed and flanged to combinestrength with lightness, is connected at its end portions by pivot bolts10 to the divergent arms 11 of the keeper plate.

Draft rollers 12 are journaled on the pivot bolts to travel on theconcave marginal portion of the circle bar. A draft rod 13 has a forkedend embracing the forward semicircular portion of the yoke to which itis coupled by a pivot pin 14 and a guard pin 15 traveling in a segmentalslot 16 in the yoke. The outer end of the draft rod 13 is connected inany well known manner to the operating member of an air brake system orto the hand Wheel of an ordinary brake. Preferably the rollers 8 areslightly crowned to allow them to rock freely on the circle bar surface.Projections or hooks 17 on the upper surface of the yoke are engaged bychain hangers 18 or other suitable means secured to the body of the carabove the truck for holding the yoke in central posi-" tion relative tothe car body. As a result of this construction. power may be appliedthrough the yoke to the brakes regardless of the angular position of thetruck in relation to thecar body within the ordinary range of motionunder usual conditions. In case a car leaves the track or the trucksplits a .switch, the yoke assists in limiting the angular deflection ofthe truck. If either of the pins coupling the draft rod to the yoke isdisplaced or broken, the companion pin retains the parts in properposition. If one of the draft roller journals breaks, the yoke merelyswings around a slight distance and performs its proper function throughthe medium of the remaining draft roller.

Obviously, changes in the details of construction may be made withoutdeparting from the spirit of the invention and I do not care to limitmyself to any particular form or arrangement of parts.

I claim:

1. The combination with brake shoes and a circle bar operativelyconnected thereto, of a yoke embracing the bar and having frictionrollers traveling on the upper face thereof, draft rollers journaled onthe yoke in contact with the concave marginal portion of the circle bar,and a draft rod pivotally secured by a double connection to the forwardportion of the yoke.

2. The combination with brake shoes and a circle bar for operating thebrake shoes, of a yoke embracing the circle bar, friction rollersjournaled in the upper portion of the yoke to travel on the upper faceof the bar, draft rollers journaled in the yoke to bear against theconcave marginal portion of the bar, a draft rod embracing the forwardportion of the yoke, a pivot pin con- 7 marginal portion of the circlebar, a draft rod embracing the forward portion of the yoke, a pivot pinconnecting the rod and yoke and a guard pin in the draft rod playing ina slot in the yoke.

4. The combination with a bogie truck, brake shoes thereon and a circlebar for operating the brake shoes having its center of C-tII'VELtllIGco-incident with the pivotal center of the truck, of a yoke embracingthe circle bar with friction and draft rollers bearing on the faces ofthe bar, a draft rod pivot-ally connected to the yoke, and centeringmeans for suspending the yoke from a point above the circle bar.

5. The combination with brake shoes and a circle bar for operating them,of a yoke embracing the circle bar and consisting of an upper rollerplate and a lower keeper plate integrally connected thereto withdivergent arms extending to the outer extremities of the roller plat-e,draft rollers journaled in pockets in the under face of the roller plateto travel on the proximate face of the circle bar, pivot pins couplingthe arms of the keeper plate and adjacent portions of the roller plate,draft rollers each journaled on a pivot pin in contact with the adjacentconcave marginal face of the circle bar, a draft bar, a pivot pinconnecting the I draft bar and yoke and a guard pin in the draft rodtraveling in a slot in the yoke.

6. The combination with a bogie truck, brake shoes thereon, a circle barhaving a center of curvature coincident with the pivot center of thetruck, and operating connections between the circle bar and brake shoes,of a yoke riding on the circle bar and having a roller plate overlyingthe bar and a keeper plate underlying the bar, rollers loosely journaledin pockets in the roller plate to bear against the upper face of thecircle bar, draft rollers journaled between the enclzportions of theroller and keeper plates in contact with the concave marginal face ofthe circle bar, a draft rod pivotally connected at the forward portionof the yoke to swing in the plane of the circle bar and centering meansattached to the roller plate and adapted to be secured to points ofsupport above the circle bar.

7. The combination with a truck, bra-keshoes on the truck and a circlebar having a center of curvature coincident with the pivot center of thetruck, of a yoke embracing the bar and having friction bearings anddraft elements in rolling contact'with the circle bar, and a draft rodpivotally secured to the forward portion of the yoke.

8. The combination with a truck, brake shoes on the truck and a circlebar having a center of curvature coincident with the pivot center of thetruck, of a yoke traveling on the circle bar, friction elements in theyoke rollingon the bar, a pair of draft members on the yoke in rollingcontact with the concave marginal face of the bar, and a draft barpivoted to the forward part of the yoke.

In testimony whereof I aflix my signature in presence of two witnesses.

LUZIAN ZINK.

Witnesses:

C. R. STIoKnEY, ANNA M. Donn.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

